I don't think there is any problem with using DC for a bell. I had one for
years that ran off four D cells, but the thing is that most mechanical ones,
if you like the real chime type employ solonoids which simply goone way
when you hit the bell push and bounce back the other when you let go again
and the idiots that lean on the bell push seem to be multiplying and started
to wear out the batteries. I guess modern bells could hav ehe solonoids
operated by a circuit instead to stop this sort of thing from happening. In
the case above though the transformer and its rectified output put paid to
leaking batteries for ever, well untill I fitted a door phone and decided to
use its naff sounding honking as the bell!

Brian

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Brian Gaff....Note, this account does not accept Bcc: email.
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"larkim" wrote in message
...
Just curious, why do most wired doorbells need a transformer, with the
associated hassle of wiring from a mains source to the tranformer and then
to the bell, when they could just as easily use a 9V battery in the sounder
unit instead?

I presume there's a good reason, just I'm too much of a numpty to work it
out for myself.

I know there are some battery only devices, but they are all horrible and
don't meet SWMBO's audio requirements nor visual aesthetic requirements.
And wiring something up doesn't meet my requirements. (And wireless ones
are either crap, don't work in my house, look ugly or don't make the right
sort of ring for SWMBO!).

Matt